4L60E lost 3rd and 4th+ delayed shifts into second

[chaaassmm]

hey so the other day i was heading to mu aunts when all of a sudden i couldn't go past second. stopped at her place since i was just down the road when it happened. checked fluids and it was ok. topped it up+ added stop slip. now when i drive first gear refuses to shift before 3k then has a super slow yet hard shift. and when i am driving unless I'm doing the speed limit collated with the rpm. nothing will happen/ the rpms with drop and the truck coasts like it's in neutral. 

 

i swapped the tranny fuse (fuse #4) to see if that would do anything and it didn't. 

 

would it be the 3rd/4th clutch packs? or more of a torque converter?

 

from what i have read online .

 

the truck doesn't throw any check lights. not sure about codes as i don't have a code reader.

 

also i cannot use the column shifter. as when i try to manually shift any of the gears it just revs and acts like neutral. 

 

 

 

[dna9656]

The 4L60E has somecweek parts, i got mine rebuilt to 4L70E specs for add'l $$$, worth every Nicole. More clutches, other stuff. Only use AC Delco Dex 6 in the tranny and Xfer case.

[richard wysong]

Trans codes may not light the CEL, take it to the parts store and get it scanned, post the codes AND their definitions here and I'm sure someone will respond

[mjm-1957]

3-4 clutch pack is smoked. Common problem on the 4l60e. Trans will have to come out and be overhauled. They are a weak unit to begin with.

[diyer2]

B.S. My 4L60E in my 93 Silverado went over 200k miles and I towed with it. Fluid service very 30k miles. I put a drain plug in the trans pan, drain and fill. I used Valvoline trans max.  

[Grumpy Bear]

3 hours ago, mjm-1957 said:

3-4 clutch pack is smoked. Common problem on the 4l60e. Trans will have to come out and be overhauled. They are a weak unit to begin with.

 

Guys that break these units are running them boosted, on NOS, overloaded, overheated or not maintaining them.

 

And yes, the 3/4 clutch drum is 'usually' the first thing to go. But does not operating within design and failing to maintain make the unit weak? Or the operator.....

 

1 hour ago, diyer2 said:

B.S. My 4L60E in my 93 Silverado went over 200k miles and I towed with it. Fluid service very 30k miles. I put a drain plug in the trans pan, drain and fill. I used Valvoline trans max.  

 

Yea, this is a well maintained unit that was used 'as designed'. Tip O' the Hat sir.